Isotropic optical filter and method of manufacturing thereof
US9213128B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 2011 |
| Grant date | Dec 15, 2015 |
| Priority date | — |
| Expiry date | Oct 31, 2031 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42D2035/24
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The present invention discloses an isotropic optical filter comprising high-index refraction material positioned between low-index-refraction matter. At least some of the high-index refraction material has a grated structure and lateral and vertical dimensions with respect to the low-index-refraction matter such that the high-index refraction material is operative to act as a leaky waveguide for light incident on the ZOF. The grated structure comprises at least two different grating patterns. Each of the at least two grating patterns constitutes a subpixel. A plurality of subpixels is operative to diffract incident light to at least two zero-order wavelength spectra respective of the at least two grating patterns such to exhibit an isotropic color effect with respect to the rotational orientation of the isotropic optical filter. The plurality of subpixels constitute an isotropic pixel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.